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Proton-Transfer-Activated polyamine for highly efficient CO2 capture.

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Title: Proton-Transfer-Activated polyamine for highly efficient CO2 capture.
Authors: Jiang, Bin1 (AUTHOR), Meng, Haoyu1 (AUTHOR), You, Chuan1 (AUTHOR), Dai, Hongyan1 (AUTHOR), Chen, Meisi1,2 (AUTHOR) chenmeisi1995@163.com, Zhang, Feng1 (AUTHOR) zf@nju.edu.cn, Zhang, Zhibing1,3 (AUTHOR) zbzhang@nju.edu.cn
Source: Separation & Purification Technology. Dec2025:Part 1, Vol. 378, pN.PAG-N.PAG. 1p.
Subjects: Polyamines, Carbon sequestration, Sorbents, Proton transfer reactions, Zwitterions, Thermal analysis, Energy consumption
Abstract: • Develop a proton-activated absorbent (abbreviated as PTTH) to enhance polyamine-based CO 2 capture via proton transfer. • Achieve a high CO 2 loading of 4.10 mol/kg, along with significantly enhanced absorption rate and amine utilization. • Reveal the proton transfer activation mechanism via zwitterionic intermediates using spectroscopy and quantum calculations. • Reduce regeneration energy to 2.08 GJ/t CO 2 , 45% lower than that of 30% MEA solution. Due to the presence of multiple amine groups in its molecular structure, the polyamine possesses a theoretically high CO 2 loading capacity. However, its high viscosity and low amine site utilization limit both its absorption efficiency and industrial applicability. In this study, a novel proton-activated absorbent system (composed of protic ionic liquids (PILs), triethylenetetramine (TETA) and H 2 O, abbreviated as PTTH) was developed to enhance the CO 2 capture performance of polyamine through proton transfer activation of its amine groups. The results demonstrate that PTTH achieves a high CO 2 loading capacity of 4.10 mol/kg (50 % absorbent concentration) while enhancing the absorption rate by a factor of 3.46. Spectroscopic analyses and quantum chemical calculations reveal that PILs capture CO 2 to form zwitterions, which subsequently transfer protons to the amine groups of the polyamine, effectively activating amino groups and enhancing CO 2 capture. Thermodynamic calculations further show that the regeneration energy consumption of PTTH is only 2.08 GJ/tCO 2 , merely 55 % of that required for the 30 % MEA aqueous solution. This study provides a new insight into the design of high-capacity, high-efficiency, and low-energy- consumption polyamine-based CO 2 absorbents. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• Develop a proton-activated absorbent (abbreviated as PTTH) to enhance polyamine-based CO 2 capture via proton transfer. • Achieve a high CO 2 loading of 4.10 mol/kg, along with significantly enhanced absorption rate and amine utilization. • Reveal the proton transfer activation mechanism via zwitterionic intermediates using spectroscopy and quantum calculations. • Reduce regeneration energy to 2.08 GJ/t CO 2 , 45% lower than that of 30% MEA solution. Due to the presence of multiple amine groups in its molecular structure, the polyamine possesses a theoretically high CO 2 loading capacity. However, its high viscosity and low amine site utilization limit both its absorption efficiency and industrial applicability. In this study, a novel proton-activated absorbent system (composed of protic ionic liquids (PILs), triethylenetetramine (TETA) and H 2 O, abbreviated as PTTH) was developed to enhance the CO 2 capture performance of polyamine through proton transfer activation of its amine groups. The results demonstrate that PTTH achieves a high CO 2 loading capacity of 4.10 mol/kg (50 % absorbent concentration) while enhancing the absorption rate by a factor of 3.46. Spectroscopic analyses and quantum chemical calculations reveal that PILs capture CO 2 to form zwitterions, which subsequently transfer protons to the amine groups of the polyamine, effectively activating amino groups and enhancing CO 2 capture. Thermodynamic calculations further show that the regeneration energy consumption of PTTH is only 2.08 GJ/tCO 2 , merely 55 % of that required for the 30 % MEA aqueous solution. This study provides a new insight into the design of high-capacity, high-efficiency, and low-energy- consumption polyamine-based CO 2 absorbents. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2025.134459